Sleep Loss Lower Testosterone in Healthy Young Men

Study Reveals the Impact of Sleep Loss Lower Testosterone Levels in Young Men

Cutting back on sleep drastically reduces a healthy young man’s testosterone levels. It is according to a study published in the June 1 issue of the Journal of the American Medical Association (JAMA).

Findings of the Study Conducted by Dr. Eve Van Cauter

Eve Van Cauter is a PhD professor of medicine and director of the study He found that men who slept less than five hours a night for one week in a laboratory had significantly lower levels of testosterone than when they had a full night’s sleep.

Low testosterone has a host of negative consequences for young men, and not just in sexual behavior and reproduction. It is critical in building strength, muscle mass, and bone density.“Low testosterone levels are associated with reduced well-being and vigor, which may also occur as a consequence of sleep loss,” said Van Cauter.

Sleep Deprivation and Its Prevalence in the US

At least 15% of the adult working population in the US gets less than 5 hours of sleep a night. They suffer many adverse health effects because of it. This study found that skipping sleep reduces a young man’s testosterone levels by the same amount as aged 10 to 15 years. “As research progresses, low sleep duration and poor sleep quality are increasingly recognized as endocrine disruptors,” Van Cauter said.

Methodology and Results of the Study

Specialists recruited the ten young men in the study from around the University of Chicago campus. They passed a rigorous battery of tests to screen for endocrine or psychiatric disorders and sleep problems. They were an average of 24 years old, lean, and in good health.

For the study, they spent three nights in the laboratory, sleeping for up to ten hours. Additionally, eight nights sleeping less than five hours. The specialists sampled their blood every 15 to 30 minutes for 24 hours during the last day of the ten-hour sleep phase and the last day of the five-hour sleep phase.

The effects of sleep loss on testosterone levels were apparent after just one week of short sleep. Five hours of sleep decreased their testosterone levels by 10% to 15%. The young men had the lowest testosterone levels in the afternoons on their sleep restricted days, between 2 pm and 10 pm.

The young men also self-reported their mood and vigor levels throughout the study. They reported a decline in their sense of well-being as their blood testosterone levels declined. Their mood and vigor fell more every day as the sleep restriction part of the study progressed.

Linking Testosterone Decline to Age and Symptoms

Testosterone levels in men decline by 1% to 2% a year as they age. Testosterone deficiency is associated with low energy, reduced libido, poor concentration, and fatigue.

Article Source: http://www.eurekalert.org/pub_releases/2011-05/uocm-sll053111.php

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